Loop and store key value from associative array in PHP

Question

I'm trying to extract values from a PHP associative array I have created from an SQL query

SELECT WEEKDAY(Date) AS weekday, 100 * SUM(Att_Type) / COUNT(Att_Type) AS percentage 
FROM Attendance 
WHERE ID=$ID AND WEEK(Date) = WEEK(NOW()) 
GROUP BY WEEKDAY(Date)

which is being stored in the variable $arr with the contents I have found using the print_r command:

Array ( [weekday] => 2 [percentage] => 100.0000 ) 
Array ( [weekday] => 1 [percentage] => 100.0000 ) 
Array ( [weekday] => 0 [percentage] => 66.6667 ) 
Array ( [weekday] => 3 [percentage] => 100.0000 )

I'm new to PHP associative arrays and I was wondering how I could create a function where it will take the value of the weekday key, if it is 0 (Monday), store the value of the percentage key in the Monday variable and so on for the rest of the weekday values available up to 4 (Friday).

EDIT:

The output I am looking for is where the values are saved to independent variables so when called they plainly display the value such as:

$monday = 66.6667
$tuesday = 100.0000
$wednesday = 100.0000
$thursday = 100.0000
$friday = 0 //when there is no value corresponding to that weekday in the array then it will be 0

so they can be echoed later in the code.

Answer 1

$data = [['weekday' => 2, 'percentage' => 100.0000,], ['weekday' => 1, 'percentage' => 100.0000,], ['weekday' => 0, 'percentage' => 66.6667,], ['weekday' => 3, 'percentage' => 100.0000,]];    

$days = ['monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday', 'sunday'];

foreach ($days as $day) {
    ${$day} = 0;
}

If you're using $results = mysqli_fetch_all($result, MYSQLI_ASSOC) to get the array of the results use this;

$results = mysqli_fetch_all($result, MYSQLI_ASSOC);

foreach($results as $arr) {
    ${$days[$arr['weekday']]} = $arr['percentage'];
    // $arr['weekday'] gets the weekday of the array;
    // $days[$arr['weekday']] gets the day index from the days array
    // ${$days[$arr['weekday']]} then creates a variable with the particular weekday as the variable name
}

Or if you're using while ($arr = mysqli_fetch_assoc($result))

while ($arr = mysqli_fetch_assoc($result)) {
    ${$days[$arr['weekday']]} = $arr['percentage'];
}